StringPatternSequence


1   /*
2    * Copyright (c) 2003-2006, Franz-Josef Elmer, All rights reserved.
3    *
4    * Redistribution and use in source and binary forms, with or without 
5    * modification, are permitted provided that the following conditions are met:
6    * 
7    * - Redistributions of source code must retain the above copyright notice, 
8    *   this list of conditions and the following disclaimer.
9    * - Redistributions in binary form must reproduce the above copyright notice, 
10   *   this list of conditions and the following disclaimer in the documentation 
11   *   and/or other materials provided with the distribution.
12   *
13   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
14   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 
15   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
16   * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
17   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
18   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
19   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20   * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
21   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
22   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
23   * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
24   */
25  package classycle.util;
26  
27  import java.util.ArrayList  ;
28  
29  /**
30   * Sequence of {@link StringPattern StringPatterns}.
31   * 
32   * @author  Franz-Josef Elmer
33   */
34  public abstract class StringPatternSequence implements StringPattern
35  {
36    protected final ArrayList   _patterns = new ArrayList  ();
37    
38    /**
39     * Appends the specified pattern.
40     */
41    public void appendPattern(StringPattern pattern)
42    {
43      _patterns.add(pattern);
44    }
45    
46    public String   toString()
47    {
48      StringBuffer   buffer = new StringBuffer  ();
49      int size = _patterns.size();
50      if (size > 1)
51      {
52        buffer.append('(');
53      }
54      for (int i = 0; i < size; i++)
55      {
56        if (i != 0)
57        {
58          buffer.append(getOperatorSymbol());
59        }
60        buffer.append(_patterns.get(i));
61      }
62      return new String  (size > 1 ? buffer.append(')') : buffer);
63    }
64    
65    /**
66     * Returns the operator symbol for pretty printing. Needed by
67     * <code>toString()</code>.
68     */
69    protected abstract String   getOperatorSymbol();
70  
71  }
72
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